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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0219 -21- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION AND OPERATION OF NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL FACILITY, SAN JOAQUIN COUNTY [or, for a retest,provide a measurably significant indication] of a release or a change in the nature or extent of the release, at that well, if either: 1) The data contains two or more analytes that are detected in less than 10% of background samples that equal or exceed their respective MDLs; or 2) The data contains one analyte that equals or exceeds its PQL. b. Discrete Retest [27CCR§20415(e)(8)(E)]: 1) In the event that the discharger concludes (pursuant to paragraph 19.a., above)that there is a preliminary indication, then the discharger shall immediately notify Regional Board staff by phone or e-mail and,within 30 days of such indication, shall collect two new(retest) samples from the indicating compliance well. 2) For any given compliance well retest sample, the discharger shall include, in the retest analysis, only the laboratory analytical results for those analytes indicated in that well's original test. As soon as the retest data are available, the discharger shall apply the same test [under 19.a.], to separately analyze each of the two suites of retest data at that compliance well. 3) If either(or both) of the retest samples trips either(or both) of the triggers under 119.a., then the discharger shall conclude that there is a measurably significant increase at that well for the analyte(s)indicated in the validating retest sample(s) and shall: a) Immediately notify the Board about the constituent verified to be present at the monitoring point, and follow up with written notification submitted by certified mail within seven days of validation; and b) If the Discharger believes that the constituent is from a source other than the Unit, then: (a) Within seven days of determining"measurably significant" evidence of a release, submit to the Board by certified mail a Notification of Intent to make such a demonstration pursuant to §20420(k)(7) of Title 27; and (b) Within 90 days of determining"measurably significant"evidence of a release, submit a report to the Board that demonstrates that a source other than the Unit caused the evidence, or that the evidence resulted